#define led1 11
#define led2 10
#define led3 9
#define led4 6
#define led5 5
#define led6 3
#define potPin A0

int i;
int j;
int potValue;
int kecepatan;
int terang;

void hitungKecepatan() {
  Serial.flush();
  potValue = analogRead(potPin);
  kecepatan = map(potValue, 0, 1023, 50, 1000);
  Serial.print("kecepatan nya :");
  Serial.println(kecepatan);
}

void ledJalan(int led = 0, String mode = "kaku", int pwm = 0) {

  if (mode == "kaku") {
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    digitalWrite(led5, LOW);
    digitalWrite(led6, LOW);
    switch (led) {
      case 0:
        digitalWrite(led1, LOW);
        digitalWrite(led2, LOW);
        digitalWrite(led3, LOW);
        digitalWrite(led4, LOW);
        digitalWrite(led5, LOW);
        digitalWrite(led6, LOW);
        hitungKecepatan();
        break;
      case 1:
        digitalWrite(led1, HIGH);
        hitungKecepatan();
        break;
      case 2:
        digitalWrite(led2, HIGH);
        hitungKecepatan();
        break;
      case 3:
        digitalWrite(led3, HIGH);
        hitungKecepatan();
        break;
      case 4:
        digitalWrite(led4, HIGH);
        hitungKecepatan();
        break;
      case 5:
        digitalWrite(led5, HIGH);
        hitungKecepatan();
        break;
      case 6:
        digitalWrite(led6, HIGH);
        hitungKecepatan();
        break;
    }
  } else if (mode == "halus") {
    switch (led) {
      case 0:
        digitalWrite(led1, LOW);
        digitalWrite(led2, LOW);
        digitalWrite(led3, LOW);
        digitalWrite(led4, LOW);
        digitalWrite(led5, LOW);
        digitalWrite(led6, LOW);
        hitungKecepatan();
        break;
      case 1:
        analogWrite(led1, pwm);
        hitungKecepatan();
        break;
      case 2:
        analogWrite(led2, pwm);
        hitungKecepatan();
        break;
      case 3:
        analogWrite(led3, pwm);
        hitungKecepatan();
        break;
      case 4:
        analogWrite(led4, pwm);
        hitungKecepatan();
        break;
      case 5:
        analogWrite(led5, pwm);
        hitungKecepatan();
        break;
      case 6:
        analogWrite(led6, pwm);
        hitungKecepatan();
        break;
    }
  }
}

void setup() {
  Serial.begin(9600);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
}

void loop() {
  // variasi 1
  for (j = 1; j <= 4; j++) {
    for (i = 1; i <= 6; i++) {
      ledJalan(i);
      delay(kecepatan);
    }
    for (i = 6; i >= 1; i--) {
      ledJalan(i);
      delay(kecepatan);
    }
  }
  // variasi 2
  for (j = 4; j >= 1; j--) {
    for (i = 1; i <= 6; i++) {
      terang = map(i, 1, 6, 200, 1);
      ledJalan(i, "halus", terang);
      delay(kecepatan);
    }
    ledJalan(0);
    delay(kecepatan + 100);
    for (i = 6; i >= 1; i--) {
      terang = map(i, 1, 6, 1, 200);
      ledJalan(i, "halus", terang);
      delay(kecepatan);
    }
    ledJalan(0);
    delay(kecepatan + 100);
  }
}